Article
Materials Science, Ceramics
Fangbin Wei, Leiyang Zhang, Ruiyi Jing, Qingyuan Hu, D. O. Alikin, Y. Ya Shur, Jie Zhang, Xu Lu, Yangxi Yan, Hongliang Du, Xiaoyong Wei, Li Jin
Summary: In this study, environmentally friendly Bi-substituted BCZT ferroelectric ceramics were prepared and their dielectric, electrostrictive, and electrocaloric properties were investigated. The results showed that increasing the Bi3+ content resulted in changes in the ceramics' dielectric properties, as well as their electrostrictive and electrocaloric performance.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Wen Wang, Yangbin Ma, Ruiyi Jing, Wenjing Shi, Vladimir Shur, Xiaoyong Wei, Li Jin
Summary: This study investigates the defect dipole-assisted pinning effect in Mn-substituted BCZT ceramics. The results show that Mn dopants combined with oxygen vacancies form defect dipoles, enabling a precise establishment of the pinning effect. This study provides valuable insights into doping effects in other lead-free ferroelectrics.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Charanjeet Singh, Gaurav Vats, Ashok Kumar
Summary: This study presents the processing and characterization of Pb0.96Sm0.025[Mg1/3Nb2/3](0.70)Ti0.30O3 (Sm-PMN-PT) polycrystalline ceramics for solid-state refrigeration. The composition exhibited high polarization and piezoelectric coefficients, and also showed a pyroelectric coefficient in a certain temperature range. Compared to parent PMN-PT, this composition had a ferroelectric transition above room temperature, making it more suitable for devices. Furthermore, calculations showed that it had a maximum electrocaloric effect (ECE) entropy and temperature changes for a broad temperature range.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Vikas N. Thakur, Atul Thakre, Hitesh Borkar, Ashok Kumar
Summary: This study investigates the dielectric, ferroelectric, pyroelectric, and electrocaloric properties of lead-free Ba-0.6(Bi0.5Li0.5)(0.4)TiO3 (BBLT) ferroelectric ceramic under illumination conditions. The results show significant changes in the electrical parameters of the ferroelectric ceramic under light exposure, enhancing the polarization, pyroelectric coefficient, and electrocaloric effects.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Physics, Applied
J. W. Adkins, I. Fina, F. Sanchez, S. R. Bakaul, J. T. Abiade
Summary: In this study, the influence of controllable polarization reversal and built-in electric fields on pyroelectric and electrocaloric effects in a BaTiO3 thin film is examined using a modified indirect method. It is found that the magnitude of the sample's change in polarization with temperature is sensitive to the degree of polarization reversal. The pyroelectric response is small at low fractions of switched polarization and grows larger with higher fractions of reversal. This is attributed to the destabilizing effect of the internal built-in field on low fractions of switched polarization.
APPLIED PHYSICS LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Nishchay Saurabh, Satyanarayan Patel
Summary: The study investigates the impact of nonstoichiometry on the properties of ceramics, including pyroelectric, electrocaloric, and energy storage properties. It was found that nonstoichiometry can affect these properties significantly, and adjusting nonstoichiometry can lead to improvements in material performance and energy storage efficiency.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Review
Acoustics
Zhen Liu, Teng Lu, Xianlin Dong, Genshui Wang, Yun Liu
Summary: The review discusses the importance of dynamic temperature sensing and infrared detection/imaging near room temperature in various applications, emphasizing the role of ferroelectric (FE) materials in these processes. It also explores recent advancements in FE ceramic materials for pyroelectric detection applications, focusing on different systems such as Pb(Zr,Ti)O-3-based and (Bi,Na)TiO3-based. The review aims to provide guidance for enhancing the pyroelectric properties of these materials and exploring new candidates for temperature and infrared sensing/detection applications in the future.
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL
(2021)
Article
Nanoscience & Nanotechnology
Chao Zhang, Zhanming Dou, Shizhi Zeng, Kanghua Li, Fangfang Zeng, Wenrong Xiao, Shiyong Qiu, Guifen Fan, Shenglin Jiang, Wei Luo, Qiuyun Fu, Guangzu Zhang
Summary: This study introduces low-radius Li+ into BaZr0.2Ti0.8O3 (BZT) through ion substitution engineering, leading to a change in internal lattice stress and a significant enhancement of the ferroelectric properties in BZT ceramics. Under the conditions of 333 K and 70 kV cm-1, the adiabatic temperature change of 5.7 mol% Li2CO3-doped BZT is 1.37 K, which is higher than that of pure BZT ceramics (0.61 K). Therefore, this work provides a simple but effective approach to design high-performance electrocaloric materials for next-generation refrigeration.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
H. N. Li, J. H. Li, Y. C. Shi, B. H. Zhang, L. Lin, R. Liu, S. J. Wu, X. F. Li, J. Shang, Y. C. Hu, X. W. Wang
Summary: A series of BCZT-xNi ceramics were prepared by the sol-gel method. The doping of Ni resulted in a decrease in average grain size and changes in dielectric and ferroelectric properties. The sample with x = 0.01 showed high dielectric constant and good frequency stability, while the sample with x = 0.02 exhibited high energy density and energy efficiency. Cation replacement was found to be an effective way to adjust the properties of BCZT ceramics.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Chemistry, Multidisciplinary
Hend Kacem, Ah Dhahri, F. Aouaini, Z. Sassi, L. Seveyrat, L. Lebrun, J. Dhahri
Summary: In this study, a BaTi0.91Sn0.08Zr0.01O3 (BTSZ) ceramic was prepared and its structural, dielectric, ferroelectric, and pyroelectric properties were studied. The ceramic exhibited phase transitions close to room temperature, resulting in improved piezoelectric, pyroelectric, and electrocaloric performance. The effects of electric field poling and the Olsen cycle on the ceramic's properties were also investigated.
Article
Chemistry, Physical
Jie Wu, Gaochao Zhao, Chengbing Pan, Kun Tao, Jie Yang, Xuebin Zhu, Peng Tong, Lihua Yin, Wenhai Song, Yuping Sun
Summary: We investigated the effect of A-site disorder on the properties of lead-free Ba1-x-ySrxCayTiO3 perovskites and found that decreasing A-site disorder leads to reduced tetragonal distortion, ferroelectric transition temperature, and the temperature of the maximum electrocaloric effect. By optimizing the A-site disorder, the highest adiabatic temperature change can be achieved.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Lipeng Zhu, Xiangjun Meng, Jianye Zhu, Ye Zhao, Yong Li, Xihong Hao
Summary: By forming relaxor ferroelectric and constructing multilayer ceramic capacitor, enhanced room temperature ECE was achieved in lead-free material, showing promising potential for solid-state cooling applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Ceramics
Xinkun Liu, Ying Dai, Xinmei Pei, Wen Chen
Summary: Lead-free Sr-doped BCZT thin films were successfully prepared and their structure, electric properties and ECE were investigated. The results show that the phase transition temperatures of the films change with increasing Sr content and merge at room temperature. The BCZT-0.05Sr film exhibits a giant ECE near room temperature.
CERAMICS INTERNATIONAL
(2023)
Article
Physics, Applied
G. Taxil, M. Lallart, B. Ducharne, T. T. Nguyen, H. Kuwano, T. Ono, G. Sebald
Summary: The energy conversion potential of ferroelectric materials, specifically in temperature ranges and electric field values, is highly promising. Pyroelectric energy harvesting, which converts thermal energy directly into electrical energy, is most effectively achieved through the Olsen cycle. This study successfully modeled the Olsen cycle, simulating varying temperatures and electric field directions for different crystal orientations. The results confirmed the negative electrocaloric effect previously reported, and identified the phase transitions most suitable for pyroelectric energy harvesting applications, with an energy density in the order of 10(2) mJ/cm 3.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Materials Science, Ceramics
Yogendra Singh, Satyendra Singh
Summary: This study investigates the electrocaloric effect and energy storage response in lead-free (1-x)K0.5Na0.5NbO3-xBaTiO3 (KNN-xBT) ferroelectric solid solution ceramics. The results demonstrate that the materials exhibit significant electrocaloric effect, responsivity, and recoverable energy density, suggesting their potential applications in eco-friendly refrigeration technology and energy storage devices.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Applied
Manal Benyoussef, Halima Zaari, Jamal Belhadi, Youssef El Amraoui, Hamid Ez-Zahraouy, Abdelilah Lahmar, Mimoun El Marssi
Summary: The properties of Na-0.5(Bi3/4RE1/4)(0.5)TiO3 compounds were investigated using first-principles calculations and experimental measurements. It was found that compositions with high polarization values exhibit a higher TiO6 distortion, and the effect of rare-earth elements on polarization was confirmed experimentally. The investigation of electronic properties revealed the emergence of magnetization due to the 4f orbital effect of rare-earth elements. Additionally, the study of chemical ordering showed increased relaxor properties in rare-earth doped compositions.
JOURNAL OF RARE EARTHS
(2022)
Article
Materials Science, Ceramics
Mohamed Aissa, Moneim Zannen, Manal Benyoussef, Jamal Belhadi, Matjaz Spreitzer, Zdravko Kutnjak, Mimoun El Marssi, Abdelilah Lahmar
Summary: Undoped and Dy3+ doped KNNBT ceramics were synthesized using solid-state synthesis method, with pure perovskite structure confirmed by X-ray diffraction analysis. The ceramics showed good dielectric performance, with lower dielectric losses in the dysprosium doped samples, and exhibited electrocaloric effects.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Manal Benyoussef, Moneim Zannen, Jamal Belhadi, Bouchaib Manoun, Zdravko Kutnjak, Damjan Vengust, Matjaz Spreitzer, Mimoun El Marssi, Abdelilah Lahmar
Summary: Lead-free relaxor ferroelectric Na-0.5(Bi1-xNdx)(0.5)TiO3 ceramics were synthesized using the solid-state method, showing structural transitions with increasing Nd concentration and improvements in dielectric properties and energy storage capabilities.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
M. Benyoussef, T. Mura, S. Saitzek, F. Azrour, J-F Blach, A. Lahmar, Y. Gagou, M. El Marssi, A. Sayede, M. Jouiad
Summary: Nanostructured BaTi1-xSnxO3 materials were successfully synthesized and characterized. The addition of Sn was found to alter the symmetry and Curie temperature of the material. Indirect electrocaloric properties and energy storage performances were determined through ferroelectric hysteresis loops. Sn doping in BT was found to improve the energy efficiency of the material.
CURRENT APPLIED PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Mahmoud Nasr, Lamyae Benhamou, Ahmed Kotbi, Nitul S. Rajput, Andrea Campos, Abdel-Ilah Lahmar, Khalid Hoummada, Khaled Kaja, Mimoun El Marssi, Mustapha Jouiad
Summary: In this study, tungsten disulfide (WS2) nanosheets were synthesized via one-step chemical vapor deposition and further reduced in size through high-energy ball milling with the addition of graphene. The resulting graphene@WS2 samples exhibited high optical absorption and a lower band gap compared to other samples, demonstrating good band-edge alignment with the water-splitting reaction. Additional characterization using high-resolution electron microscopy confirmed the morphology and crystal structure of the samples. Photoelectrochemical measurements revealed that the graphene@WS2 (1 wt%) sample exhibited excellent photocurrent density and higher charge transfer ability compared to pristine WS2, indicating its potential as an efficient photoanode for the hydrogen evolution reaction.
Article
Chemistry, Physical
Bouchra Asbani, Yaovi Gagou, Said Ben Moumen, Jean-Luc Dellis, Abdelilah Lahmar, M'Barek Amjoud, Daoud Mezzane, Mimoun El Marssi, Brigita Rozic, Zdravko Kutnjak
Summary: The ferroelectric property and electrocaloric effect of Ba(GexTi1-x)O-3 ceramics were investigated, showing promising results for cooling devices and energy storage applications.
Article
Chemistry, Inorganic & Nuclear
Fouad Alloun, Mohammed Hadouchi, Abderrazzak Assani, Mohamed Saadi, Abdelilah Lahmar, Mimoun El Marssi, Daoud Mezzane, Lahcen El Ammari
Summary: A new silver-cobalt-iron orthophosphate was synthesized and studied in single crystal and powder forms. The crystal structure was determined as monoclinic with C2/c space group. The phosphate consists of FeO6 and CoO6 octahedra, and PO4 tetrahedra forming infinite layers. Ag+ cations occupy the interlayer space and crystal framework cavities. The synthesized powder's purity was confirmed using X-ray diffraction analysis. The infrared and Raman spectra indicated the vibration modes of the PO4 tetrahedra. Impedance spectroscopy showed an ionic conductivity of 2.6 x 10(-3) S cm(-1) at 773 K, with Ag+ mobility in the layered structure. Magnetic investigation revealed antiferromagnetic order below T-N of 10 K and a Curie-Weiss constant of theta = -119.39 K.
JOURNAL OF SOLID STATE CHEMISTRY
(2023)
Article
Chemistry, Physical
Ilham Hamdi Alaoui, Mebarki Moussa, Nathalie Lemee, Francoise Le Marrec, Anna Cantaluppi, Delphine Favry, Abdelilah Lahmar
Summary: Rare earth element-doped Bi0.5Na0.5TiO3-BaTiO3 (BNT-BT-RE) polycrystalline thin films were prepared by chemical solution deposition on a platinized substrate. The microstructure, dielectric, and ferroelectric properties of the films were investigated, revealing an increase in dielectric constant, breakdown strength, and energy storage density for films doped with Nd and Dy. The optical properties of the films containing lanthanide element showed potential for luminescence applications. The simultaneous presence of ferroelectric and optical properties in the system holds promise for advanced optoelectronic devices.
Article
Biochemistry & Molecular Biology
Zakaria Chchiyai, Oumayema El Ghali, Abdelilah Lahmar, Jones Alami, Bouchaib Manoun
Summary: In this study, a novel porous Zn0.5Mg0.5FeMnO4 spinel oxide was successfully synthesized and demonstrated good cycling stability and specific capacity as an anode material for Li-ion batteries (LIBs).
Article
Chemistry, Analytical
Jacem Zidani, Khaoula Hassine, Moneim Zannen, Andreas Zeinert, Antonio Da Costa, Anthony Ferri, Jamal Belhadi, Mustapha Majdoub, Mimoun El Marssi, Abdelilah Lahmar
Summary: The purpose of this research was to synthesize bioderived nanocomposite films by incorporating NBTO nanoparticles into a chitosan matrix. The study found that the NBTO nanoparticles were uniformly dispersed and interlocked with other particles, forming interconnected grains with significant interspaces within the chitosan matrix. The optical properties were mainly influenced by light scattering from the NBTO particles and the distinctive bandgap exhibited by the NBTO phase. The composite films showed higher dielectric values compared to pure chitosan films, and the dielectric values increased with higher NBTO content. Piezoelectric measurements confirmed the expected piezoelectric and ferroelectric behavior of NBTO particles within the chitosan matrix, demonstrating the versatility of these materials.
Article
Chemistry, Inorganic & Nuclear
Sirine El Arni, Mohammed Hadouchi, Abderrazzak Assani, Mohamed Saadi, Mimoun El Marssi, Abdelilah Lahmar, Lahcen El Ammari
Summary: A novel pyrophosphate Na7Ni3Fe(P2O7)(4) was synthesized in two forms, single-crystal and powder. The crystal structure, purity, and morphology were determined using various techniques. It was found that the compound has a three-dimensional structure with tunnels housing Na+ cations, and exhibits antiferromagnetic behavior with two magnetic transitions.
Article
Instruments & Instrumentation
Ilham Hamdi Alaoui, Nathalie Lemee, Francoise Le Marrec, Moussa Mebarki, Anna Cantaluppi, Delphine Favry, Abdelilah Lahmar
Summary: In this study, Bismuth sodium titanate (BNT) thin films were successfully deposited using the Sol-Gel spin coating technique. The microstructural, structural, and electrical properties of the obtained film were investigated. The results showed good frequency stability of the dielectric constant and attractive electrostatic energy storage properties.
QUANTUM BEAM SCIENCE
(2023)
Article
Chemistry, Physical
Abdelilah Lahmar, Jacem Zidani, Jamal Belhadi, Ilham Hamdi Alaoui, Hussam Musleh, Jehad Asad, Naji Al Dahoudi, Mimoun El Marssi
Summary: The effect of ferromagnetic CaMnO3 (CMO) addition on the structural, magnetic, dielectric, and ferroelectric properties of BiFeO3 is investigated. The results show that CMO doping can modify the magnetic and ferroelectric properties of BiFeO3, which is of great significance for its applications.
Proceedings Paper
Materials Science, Multidisciplinary
A. Ihyadn, D. Mezzane, M. Amjoud, A. Lahmar, L. Bih, A. Alimoussa, I. A. Luk'yanchuk, M. El Marssi
Summary: Barium sodium niobate (BNN) ceramics with different amounts of BaO-Na2O-Nb2O5-P2O5 (BNNP) glass were prepared and the effect of glass content on the structural, microstructural, and dielectric properties of the ceramics was investigated. The results showed that adding BNNP glass improved the microstructure and significantly increased the dielectric constant of the ceramics.
MATERIALS TODAY-PROCEEDINGS
(2022)
Article
Chemistry, Physical
J. Zamora, T. Bautista, N. S. Portillo-Velez, A. Reyes-Montero, H. Pfeiffer, F. Sanchez-Ochoa, H. A. Lara-Garcia
Summary: Experimental and DFT studies were conducted on the structural, magnetic, and optical properties of RFeO3 perovskites. The perovskites exhibited an orthorhombic crystal structure and weak ferromagnetic behavior. They were confirmed to be semiconductors with a bandgap of approximately 2.1 eV.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xianxiang Lv, Jing Jin, Weiguang Yang
Summary: By depositing TiN and TiO2 surface layers on AlSi films, the electrochemical performance of silicon-based anodes can be significantly improved, suppressing volume expansion and promoting the formation of a stable SEI layer.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Sharafat Ali, Haider Ali, Syedul Hasnain Bakhtiar, Sajjad Ali, Muhammad Zahid, Ahmed Ismail, Pir Muhammad Ismail, Amir Zada, Imran Khan, Huahai Shen, Rizwan Ullah, Habib Khan, Mohamed Bououdina, Xiaoqiang Wu, Fazal Raziq, Liang Qiao
Summary: The construction and optimization of redox-heterojunctions using a bifunctional phosphate as an electron-bridge demonstrated significant improvements in photo catalytic activity, including enhanced dispersion, reduced interfacial migration resistance, and increased abundance of active-sites.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ren-Ni Luan, Na Xu, Chao-Ran Li, Zhi-Jie Zhang, Yu-Sheng Zhang, Jun Nan, Shu-Tao Wang, Yong-Ming Chai, Bin Dong
Summary: Extensive research has revealed that oxygen evolution reaction (OER) in alkaline conditions involves dynamic surface restructuring. The development and design of sulfide/oxide pre-catalysts can reasonably adjust the composition and structure after surface reconstruction, which is crucial for OER. This study utilized a simple two-step hydrothermal method to achieve in situ S leaching and doping, inducing the composition change and structure reconstruction of CoFe oxides. The transformed FeOOH and CoOOH exhibited excellent OER activity and could be easily mass-produced using low-cost iron based materials and simple methods.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jun'an Lai, Daofu Wu, Peng He, Kang An, Yijia Wang, Peng Feng, WeiWei Chen, Zixian Wang, Linfeng Guo, Xiaosheng Tang
Summary: Zero-dimensional organic-inorganic metal halides (OMHs) are gaining attention in the fabrication of light-emitting diodes due to their broad emission band and high photoluminescence quantum yield. This work synthesized a zero-dimensional organic tetraphenylphosphonium bismuth chloride (TBC) that showed efficient blue light emission, with the emission mechanism attributed to the transition of Bi3+ ions. White light-emitting diodes (WLEDs) were fabricated using TBC, along with green-emitting and red-emitting single crystals, achieving single-component white emissions. These findings demonstrate the different emission mechanism of ns2 ions-based OMHs and highlight the potential of bismuth-based OMHs in WLEDs applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xuewei Liang, Yunhai Su, Taisen Yang, Zhiyong Dai, Yingdi Wang, Xingping Yong
Summary: The revolutionary design concept of high-entropy alloys has brought new opportunities and challenges to the development of advanced metal materials. In this work, AlCrCuFe2NiTix high-entropy flux cored wires were prepared by combining the design idea of a high-entropy alloy with the characteristics of flux cored wire. AlCr-CuFe2NiTix high-entropy surfacing alloys were prepared using gas metal arc welding technology. The wear properties of the alloys were analyzed, and the phase composition, microstructure, strengthening mechanism, and wear mechanism were discussed. The results show that the alloys exhibit a dendritic microstructure with BCC/B2 + FCC phases. Increasing Ti content leads to the precipitation of Laves phase. The alloys show improved microhardness and wear resistance due to the precipitation of coherent B2 and Laves phases. However, excessive Ti addition results in the increase of Laves phase and reduced wear resistance of the alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
M. Vadivel, M. Senthil Pandian, P. Ramasamy, Qiang Jing, Bo Liu
Summary: This work presents the enhanced photocatalytic and electrochemical performance of g-C3N4 assisted PAA on CoFe2O4 ternary nanocomposites. The incorporation of PAA and g-C3N4 improves the separation efficiency of photogenerated charge carriers, resulting in superior photocatalytic degradation and high specific capacitance values.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Vibhu T. Sivanandan, Ramany Revathy, Arun S. Prasad
Summary: In this study, pure and doped cobalt ferrite nanoparticles were prepared using the sol-gel auto-combustion method with the aid of lemon juice as eco-fuel. The crystal structure, lattice parameter, crystallite size, microstrain, optical parameters, and room temperature magnetic properties of the samples were analyzed. The effect of doping on the magnetic properties was also investigated.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qing Guo, Bowen Zhang, Benzhe Sun, Yang Qi
Summary: This study prepared ZnO films with various nonpolar preferred orientations using conventional chemical bath deposition method and characterized their growth process and mechanism. It was found that the type and concentration of nitrate could control the preferred orientation and surface roughness of ZnO films. Additionally, ZnO films with different preferred orientations exhibited different optical properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Chong Zhang, Yan Liu, Zhaoyan Wang, Hang Yang
Summary: In this study, six bimetallic FeCo particles were synthesized via the hydrothermal method at different Fe:Co ratios. The Fe:Co ratio not only modulates the composition of the particles but also influences their structure and magnetic properties. The FeCo alloys showed a transformation from an Fe-based structure to a Co-based structure with increasing Co content. The Fe:Co ratio of 1:1 and 3:1 resulted in particles with the highest and lowest saturation magnetization, respectively.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jianning Zhang, Jing Li, Yiren Wang, Xiaodong Mao, Yong Jiang
Summary: We conducted a study on the formation of ultra-fine Y-Ti-Ta-O nano-oxides in Ta+B micro-alloyed 13CrWTi-ODS alloys using electron microscopy and first-principles calculations. The Y-Ti-Ta-O nano-oxides were found to be mainly Y2(Ti,Ta)2O7, with an average size of 7 nm and a number density of 6.8 x 1023 m-3. Excess boron was found to enhance the adhesion of some low-sigma grain boundaries but weaken the Fe/Y2Ti2O7 interface, while excess tantalum enhanced the Fe/Y2Ti2O7 interface but caused serious degradation of grain boundaries.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Yirong Fang, Pei Cheng, Hang Yuan, Hao Zhao, Lishu Zhang
Summary: A new composite system of nitrogen-doped reduced graphene oxide and black phosphorus quantum dots has been developed for tumor therapy, showing improved electrochemical properties and stability. The system generates hydrogen peroxide and hydroxyl radical to effectively kill tumor cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xiufang Qin, Yuanli Ma, Hui Zhang, Ting Zhang, Fang Wang, Xiaohong Xu
Summary: The structure and magnetism of cobalt ferrites after Mn2+-Tb3+ co-doping were studied. Co-doped samples exhibited cubic spinel structure and spherical shape of ferrite nanoparticles. The redistribution of Co2+ and Fe3+ ions between octahedral and tetrahedral sites was observed due to Mn2+-Tb3+ co-doping. The coercivity and magnetization saturation of co-doped samples were significantly improved, leading to a maximum energy product that is 190% higher than that of the un-doped sample.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ho Yeon Lee, Wonjong Yu, Yoon Ho Lee
Summary: Recently, there has been an increasing interest in developing ultra-fine nanostructured electrodes with extensive reaction areas to enhance the performance and low-temperature operation of solid oxide fuel cells. The use of a refined approach involving co-sputtering metal alloys and oxide targets has demonstrated the feasibility of nano-columnar structures in perovskite-based electrodes, expanding the temperature range of thin film electrodes. This study systematically examines the effects of chamber pressure control in the co-sputtering process and identifies the intricate relationship between sputtering pressure and film structure. By fine-tuning the columnar growth in the electrode, significant improvements in performance and thermo-mechanical properties were achieved, resulting in high-performance all-sputtered solid oxide fuel cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qianyun Bai, Xiaoxiao Yan, Da Liu, Kang Xiang, Xin Tu, Yanhui Guo, Renbing Wu
Summary: This study proposes a simple method to develop a non-precious transition metal-based electrocatalyst with high catalytic activity and robustness for the hydrogen evolution reaction. The as-synthesized electrode exhibits a low overpotential and high current density, indicating its potential in energy conversion.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)